Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...721.1509r&link_type=abstract
The Astrophysical Journal, Volume 721, Issue 2, pp. 1509-1514 (2010).
Astronomy and Astrophysics
Astronomy
6
Cosmic Background Radiation, Cosmology: Theory, Dark Matter
Scientific paper
In this paper, we consider the hypothesis in which a species of ultra light bosonic dark matter (ULBDM) with mass mB ~ 10-22 eV could be the dominant dark matter (DM) in the universe. As a first approach we work in the context of kinetic theory, where ULBDM is described by the phase space distribution function whose dynamics is dictated by the Boltzmann-Einstein equations. We investigate the effects that this kind of DM imprints in the acoustic peaks of the cosmic microwave background. We find that the effect of the Bose-Einstein statistics is small, albeit perceptible, and is equivalent to an increase of non-relativistic matter. It is stressed that in this approach, the mass-to-temperature ratio necessary for ULBDM to be a plausible DM candidate is about five orders of magnitude. We show that reionization is also necessary and we address a range of consistent values for this model. We find that the temperature of ULBDM is below the critical value implying that Bose-Einstein condensation is inherent to the ULBDM paradigm.
Magana Juan
Matos Tonatiuh
Pérez--Lorenzana Abdel
Rodríguez-Montoya Iván
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